Added 'return' key support to OpenGL base app.
Added 'return' key support to OpenGL base app.

OpenTechEngine/CEGUI,OpenTechEngine/CEGUI,OpenTechEngine/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,ruleless/CEGUI,ruleless/CEGUI,ruleless/CEGUI